U.K. air navigation service provider NATS has commissioned and accepted into operational service Saab Sensis' Wide Area Multilateration (WAM) system at Edinburgh Airport (EDI).
The WAM system provides NATS’ air traffic controllers with the precise surveillance needed for separation of flights arriving and departing from EDI. NATS installed and validated the WAM and transitioned it to service as the first operational use of WAM surveillance at a U.K. airport.
At Edinburgh, Saab Sensis WAM is replacing Monopulse Secondary Surveillance Radar (MSSR). The Saab Sensis system is providing surveillance of commercial, general aviation and helicopter traffic to a range of 60 nautical miles from the airport. NATS controllers at Edinburgh are using the WAM surveillance to provide a separation service to aircraft within their Terminal Maneuvering Area.
“WAM has effectively replaced MSSR as the terminal area surveillance source for aircraft separation at this busy airport,” said Iain Harris, Director, NATS Engineering. “This technology is a more flexible long-term solution that is more accurate and suitable for this operational requirement than a traditional MSSR.”
Multilateration is commonly used in civil and military surveillance applications to accurately locate an aircraft, vehicle or stationary emitter by measuring the "Time Difference of Arrival" (TDOA) of a signal from the emitter at three or more receiver sites.
If a pulse is emitted from a platform, it will arrive at slightly different times at two spatially separated receiver sites, the TDOA being due to the different distances of each receiver from the platform. In fact, for given locations of the two receivers, a whole set of emitter locations would give the same measurement of TDOA. Given two receiver locations and a known TDOA, the locus of possible emitter locations is a one half of a two-sheeted hyperboloid.
In simple terms, with two receivers at known locations, an emitter can be located onto a hyperboloid.Note that the receivers do not need to know the absolute time at which the pulse was transmitted – only the time difference is needed.
The WAM system provides NATS’ air traffic controllers with the precise surveillance needed for separation of flights arriving and departing from EDI. NATS installed and validated the WAM and transitioned it to service as the first operational use of WAM surveillance at a U.K. airport.
At Edinburgh, Saab Sensis WAM is replacing Monopulse Secondary Surveillance Radar (MSSR). The Saab Sensis system is providing surveillance of commercial, general aviation and helicopter traffic to a range of 60 nautical miles from the airport. NATS controllers at Edinburgh are using the WAM surveillance to provide a separation service to aircraft within their Terminal Maneuvering Area.
“WAM has effectively replaced MSSR as the terminal area surveillance source for aircraft separation at this busy airport,” said Iain Harris, Director, NATS Engineering. “This technology is a more flexible long-term solution that is more accurate and suitable for this operational requirement than a traditional MSSR.”
Multilateration is commonly used in civil and military surveillance applications to accurately locate an aircraft, vehicle or stationary emitter by measuring the "Time Difference of Arrival" (TDOA) of a signal from the emitter at three or more receiver sites.
If a pulse is emitted from a platform, it will arrive at slightly different times at two spatially separated receiver sites, the TDOA being due to the different distances of each receiver from the platform. In fact, for given locations of the two receivers, a whole set of emitter locations would give the same measurement of TDOA. Given two receiver locations and a known TDOA, the locus of possible emitter locations is a one half of a two-sheeted hyperboloid.
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